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The return value of memblock_x86_check_reserved_size() doesn't indicate whether there's an overlapping reservatoin or not. It indicates whether the caller needs to iterate further to discover all reserved portions of the specified area. efi_reserve_boot_esrvices() wants to check whether the boot services area overlaps with other reservations but incorrectly used membloc_x86_check_reserved_size(). Use memblock_is_region_reserved() instead. Signed-off-by: Tejun Heo <tj@kernel.org> Link: http://lkml.kernel.org/r/1310457490-3356-2-git-send-email-tj@kernel.org Cc: Yinghai Lu <yinghai@kernel.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@redhat.com> Cc: "H. Peter Anvin" <hpa@zytor.com> Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>